DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.2)

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Caution

•  Perform the following malfunction diagnosis only when it is diagnosed with a short to power supply by CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.)

System Wiring Diagram

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Determination Procedure

Caution

•  When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.

•  When inspecting the connector, touch it with a paper clip or similar thin pin without directly inserting a tester probe into the terminal.

•  Disconnect the negative battery terminal before performing any work that requires handling of connectors.

Step	Inspection		Action
1	INSPECT BODY CONTROL MODULE (BCM) FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector 2 which has body control module (BCM) terminals 2H and 2F. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F (wiring harness side). •  Is the voltage between 1.5—3.5 V?	Yes	Replace the body control module (BCM) because there is a short to the power supply in the body control module (BCM). (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
		No	Go to the next step.
2	INSPECT CAN LINE BETWEEN BODY CONTROL MODULE (BCM) AND CONNECTOR C-01 FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-01. •  Connect the connector 2 which has body control module (BCM) terminals 2H and 2F. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 5.
		No	Go to the next step.
3	INSPECT CAN LINE BETWEEN INTEGRATED STARTER GENERATOR (ISG) AND CONNECTOR C-02 FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-02. •  Connect the connector C-01. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the body control module (BCM) and connector C-01, C-02 because the wiring harness is shorted to the power supply.
4	INSPECT INTEGRATED STARTER GENERATOR (ISG) FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the integrated starter generator (ISG) connector. •  Connect the connector C-02. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the integrated starter generator (ISG) because there is a short to the power supply in the integrated starter generator (ISG). (See INTEGRATED STARTER GENERATOR (ISG) REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness between the integrated starter generator (ISG) and connector C-02 because the wiring harness is shorted to the power supply.
5	INSPECT CAN LINE BETWEEN CONNECTOR C-02 AND CONNECTOR C-01 FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-02. •  Connect the connector C-01. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 7.
		No	Go to the next step.
6	INSPECT PARKING LOCK ACTUATOR FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the parking lock actuator. •  Connect the connector C-02. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the parking lock actuator because there is a short to the power supply in the parking lock actuator. (See PARKING LOCK ACTUATOR REMOVAL/INSTALLATION [ET6A-EL, ET6AX-EL].)
		No	Repair or replace the wiring harness between the parking lock actuator and connector C-01, C-02 because the wiring harness is shorted to the power supply.
7	INSPECT CAN LINE BETWEEN CONNECTOR C-34 AND CONNECTOR C-02 FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-34. •  Connect the connector C-02. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the connector C-34 and connector C-02 because the wiring harness is shorted to the power supply.
8	INSPECT CAN LINE BETWEEN DC-DC CONVERTER (Mazda M Hybrid) AND CONNECTOR C-34 FOR SHORT TO POWER SUPPLY •  Measure the voltage at DC-DC converter (Mazda M Hybrid) terminals 1C and 1D. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 10.
		No	Go to the next step.
9	INSPECT DC-DC CONVERTER (Mazda M Hybrid) FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the DC-DC converter (Mazda M Hybrid). •  Connect the connector C-34. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the DC-DC converter (Mazda M Hybrid) because there is a short to the power supply in the DC-DC converter (Mazda M Hybrid). (See DC-DC CONVERTER (Mazda M Hybrid) REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness between the DC-DC converter (Mazda M Hybrid) and connector C-34 because the wiring harness is shorted to the power supply.
10	INSPECT CAN LINE BETWEEN CONNECTOR C-34 AND CONNECTOR C-04 FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-04. •  Connect the connector C-34. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 12.
		No	Go to the next step.
11	INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the electronically controlled brake unit connector. •  Connect the connector C-04. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the electronically controlled brake unit because there is a short to the power supply in the electronically controlled brake unit. (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness between the electronically controlled brake unit and connector C-04, C-34 because the wiring harness is shorted to the power supply.
12	INSPECT CAN LINE BETWEEN CONNECTOR C-39 AND CONNECTOR C-04 FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-39. •  Connect the connector C-04. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the connector C-39 and connector C-04 because the wiring harness is shorted to the power supply.
13	INSPECT CAN LINE BETWEEN SELECTOR LEVER AND CONNECTOR C-39 FOR SHORT TO POWER SUPPLY •  Measure the voltage at selector lever terminals H and F. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 15.
		No	Go to the next step.
14	INSPECT SELECTOR LEVER FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the selector lever connector. •  Connect the connector C-39. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the selector lever because there is a short to the power supply in the selector lever. (See SELECTOR LEVER COMPONENT REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness between the selector lever and connector C-39 because the wiring harness is shorted to the power supply.
15	INSPECT CAN LINE BETWEEN CONNECTOR C-39 AND CONNECTOR C-18 FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-18. •  Connect the connector C-39. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the connector C-39 and connector C-18 because the wiring harness is shorted to the power supply.
16	INSPECT CAN LINE BETWEEN CONNECTORS C-77, C-76 AND CONNECTOR C-18 FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connectors C-77, C-76. •  Connect the connector C-18. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the connectors C-77, C-76 and connector C-18 because the wiring harness is shorted to the power supply.
17	INSPECT CAN LINE BETWEEN Mazda M Hybrid BATTERY AND CONNECTORS C-77, C-76 FOR SHORT TO POWER SUPPLY •  Measure the voltage at Mazda M Hybrid battery terminals 1B and 1E. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 19.
		No	Go to the next step.
18	INSPECT Mazda M Hybrid BATTERY FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the Mazda M Hybrid battery connector. •  Connect the connectors C-77, C-76. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the Mazda M Hybrid battery because there is a short to the power supply in the Mazda M Hybrid battery. (See Mazda M Hybrid BATTERY REMOVAL/INSTALLATION.)
		No	Repair or replace the wiring harness between the Mazda M Hybrid battery and connectors C-77, C-76 because the wiring harness is shorted to the power supply.
19	INSPECT CAN LINE BETWEEN CONNECTOR C-09 AND CONNECTORS C-77, C-76 FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connector C-09. •  Connect the connectors C-77, C-76. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the connector C-09 and connectors C-77, C-76 because the wiring harness is shorted to the power supply.
20	INSPECT PCM FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the PCM connector. •  Connect the connector C-09. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off). •  Measure the voltage at body control module (BCM) terminals 2H and 2F. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the PCM because there is a short to the power supply in the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
		No	Repair or replace the wiring harness between the PCM and connector C-09 because the wiring harness is shorted to the power supply.